{"id":"839d093d-8d1a-4cde-9d35-48aa1d9726d0","shortId":"NEGaQe","kind":"x402","title":"Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at `/api/v1/notifications/86` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint is labeled \"Premium API Access\" and accepts POST requests. Payment is 0.02 USDC per call (maxAmountRequired of 20,000 base units with 6-decimal USDC), consistent with the platform's uniform $0.02/request pricing across all its endpoints.\n\nThe broader lowpaymentfee.com platform advertises categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. However, this particular endpoint (`/notifications/86`) is not listed on the homepage's catalog, and no documentation describes what it returns or what input it expects beyond being a POST endpoint returning `application/json`. The platform emphasizes no API keys, no rate limits, instant access, and payment exclusively via Base-network USDC.\n\nBecause there is no schema, documentation, or example for this specific notifications endpoint, its actual functionality is unclear. It may deliver notification data or trigger a notification action, but this is speculative. The endpoint is confirmed live — it returns a valid x402 402 challenge with payment details. Callers should be aware that the lack of input/output documentation means integration requires experimentation or contacting the provider.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","notifications","json-response","post-method"],"categories":["notifications","infrastructure"],"synonyms":["notification API","premium API access","x402 notification","pay-per-call notification","lowpaymentfee notifications","Base USDC API"],"warnings":["No documentation or schema available for this specific endpoint","Endpoint /api/v1/notifications/86 is not listed in the provider's public API catalog","Actual functionality (what notifications/86 returns or does) is unknown","Provider's /pricing, /api, and /README pages are gated behind wallet connection and returned no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/86","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/notifications/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no input/output schema, no examples, and the endpoint path (/notifications/86) is not listed on the provider's homepage catalog. Functionality is entirely unclear beyond the generic 'Premium API Access' 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'/notifications/86':124 '/request':97 '0.02':11,26,76,96 '000':83 '20':82 '402':213 '6':87 'Base USDC API' 'accept':71 'access':69,162 'across':99 'action':198 'actual':185 'advertis':107 'ai':112 'analyt':111 'api':50,68,156 'application/json':151 'awar':221 'base':8,23,58,84,168 'base-network':167 'beyond':145 'broader':104 'call':4,19,79 'caller':218 'catalog':132 'categori':108 'challeng':214 'collect':44 'confirm':206 'consist':90 'contact':233 'data':110,193 'decim':88 'deliv':191 'describ':136 'detail':217 'document':135,176,227 'emphas':154 'endpoint':6,21,32,64,102,123,149,183,204 'exampl':178 'exclus':165 'expect':144 'experiment':231 'financ':115 'function':186 'homepag':130 'howev':120 'includ':109 'infrastructur':118 'input':142 'input/output':226 'instant':161 'integr':229 'json-response' 'key':157 'label':66 'lack':224 'learn':114 'limit':160 'list':127 'live':207 'lowpaymentfee notifications' 'lowpaymentfee.com':39,105 'machin':113 'maxamountrequir':80 'may':190 'mean':228 'network':59,169 'notif':5,20,182,192,197 'notification API' 'notifications' 'offer':42 'part':36 'particular':122 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call notification' 'pay-per-request':46 'payment':74,164,216 'per':3,12,18,27,48,78 'platform':40,93,106,153 'post':72,148 'post-method' 'premium':67 'premium API access' 'price':98 'protocol':55 'provid':235 'rate':159 'request':13,28,49,73 'requir':230 'return':139,150,209 'schema':175 'settl':51 'specif':63,181 'specul':202 'trigger':195 'unclear':188 'uniform':95 'unit':85 'usdc':15,30,61,77,89,170 'usdc-settlement' 'use':60 'util':119 'valid':211 'via':9,24,52,166 'web3':116 'x402':10,25,54,212 'x402 notification' 'x402-payment'","prices":[{"id":"156d7102-77b0-4493-bf10-e2f5eef70cc9","listingId":"839d093d-8d1a-4cde-9d35-48aa1d9726d0","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/notifications/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.143Z"}],"sources":[{"listingId":"839d093d-8d1a-4cde-9d35-48aa1d9726d0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/86","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.143Z","lastSeenAt":"2026-04-22T02:32:10.722Z"}],"details":{"listingId":"839d093d-8d1a-4cde-9d35-48aa1d9726d0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/86 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/86"},{"claim":"The endpoint is labeled 'Premium API Access' and accepts POST requests returning application/json","source_url":"https://lowpaymentfee.com/api/v1/notifications/86"}],"useCases":["Retrieving or triggering notifications via a pay-per-call model without API keys","Integrating notification functionality into agent workflows that settle payments on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-use API access on Base","Low-volume notification retrieval without subscription commitments"],"notFor":["Production notification systems requiring documented schemas and SLAs","High-volume use cases where per-request pricing may add up","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.582Z"},"updatedAt":"2026-04-22T02:32:10.722Z"}}